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. 2017 May 23;8:880. doi: 10.3389/fmicb.2017.00880

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Copyright © 2017 Hou, Xiao, Chen, Kong, Wang, Chu, Kang, Sun, Hu, Li, Lu, Liao, Hu, Ni, Zou, Zhang, Fan, Zhao and Xu.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Geographic distribution of the 11 study centers involved in this study and number of isolates collected in each center (shown in brackets). Hospital codes: BD, Peking University First Hospital; GZ, The First Affiliated Hospital of Sun Yat-Sen University; H1, The First Affiliated Hospital of Harbin Medical University; H4, the Fourth Affiliated Hospital of Harbin Medical University; HX, West China Hospital; LR, The People's Hospital of Liaoning Province; PU, Peking Union Medical College Hospital; RJ, Ruijin Hospital, School of Medicine, Shanghai Jiaotong University; TJ, Tongji Hospital; TZ, Tianjin Medical University General Hospital; Z1, The First Hospital of China Medical University.